Gaya APA

Hartoyo, B. (1997). LAPORAN PERJALANAN DINAS MENGIKUTI NEDO - COAL ENGINEER TRAINING PROGRAM JOINT SEMINAR . Jakarta: Direktorat Sumber Daya Mineral.

Gaya MLA

Hartoyo, Bambang. "LAPORAN PERJALANAN DINAS MENGIKUTI NEDO - COAL ENGINEER TRAINING PROGRAM JOINT SEMINAR". Jakarta: Direktorat Sumber Daya Mineral, 1997. Batubara.